Apparatus for shaping metal pieces



Sept; 28,1926. 1,601,153

' J. L. WALKER APPARATUS FOR SHAPING METAL PIECES Filed May 13; 1922 4 sheets-sheet 1 I f r H I I Sept. 28 1926. 1 ,601,153

, J. L. WALKER APPARATUS FOR SHAPING METAL PIECES J. L. WALKER APPARATUS FOR SHAPING METAL PIECES- Sept. 28 1926. 1,601,153

Filed May 13, 1922 '4 Sheets-Sheet 5 Sept. 28,1926. 1,601,153

' J. L. WALKER v APPARATUS FOR SHAPING METAL PIECES Filed May 13, 1922 4 Sheets-Sheet 4 Patented Sept. 23, 192%.

' i t E S norm tooMIs WALKER, or crrrcaeo, rLiJNo s, nssrenoa T rnnoLL MANUFACTUR- Ine CO1VZ?a-NY, or oiiicnso, rumors, A ooaroRA'rron or rLLinors.

APLEAEATUS FORSHAPING METAL PIECES.

Application filed May. 13, 1922.

While my invention relates more particularly to the trimming of the heads of bolts and cap-screws, it is not necessarily limited to suchuse. Among the objects of this invention are to shave'from a metal part an undesired portion of the metal in 'suchmanner as to leave the surface of the metal part substantially smooth; to provide a new method of shaping metal parts so that the amount of tearing of the metal will be reduced to a minimum; to provide mechanism for removing from the surface of the metal parts, in an economical manner, any irregularities, so that the surface of the metal will. be left substantially smooth; to provide novel mechanism for accomplishing the foregoing and other functions and such further objects, advantages and capabilities as will later more fully appear;

' My invention fin ther resides in the combination, construction and arrangement of parts illustrated in: the ac'com-pnaying drawings, and while I have shown therein a pre ferred embodiment I desire the same to be understood as illustrative only and not as limiting my invention.

In the accompanying drawings:

Fig. 1 isa plan' iew of a machine embodying the principles of my invention.

Fig. 2 is an elevation of a portion of the actuating mecl'ianism for a metal piece.

F i g. 3 is a fragmentary longitudinal vertical section substantially along the plane indica d y th li e 3-3, F s- Fig; 4 is asimilar section showing the parts. in another operative position.

Fig; 5 is an other similar section showing the parts in athird operative position.

Fig. 6' is an enlarged fragmentary section showing the construction and arrangement of the die members.

Fig. 7 is a viewsimilar to Fig. 6 showing a metal piece in afurther advanced stage of its passage through the die members.

Fig. 8 is a section similar to Figs. 6 and 7", but showing the chip remove-r in the act of passing down between the dies.

Fig. 9 is a section at right angles to Fig. 8. p i

Fig. 10 is a transverse section through the machine substantially along the planeindicated by the line 1010, Fig. 5.v

Fig; 1 1 is a fragmentary sectional elevation of the wheel and associated parts, to illustrate the action of certain ones thereof.

'ing it' through the first die-plate,

Serial No. 560523.

Referring more in detail to the drawings, numeral 1 designates the, frame of the machine in which is mounted a power shaft 2, carrying, in the present instance, a fly wheel 3, which fly wheel is provided with a cam f for a purpose to be disclosed later. The frame 1 is provided with slide-ways 6 inwhich operates the slide 5 carrying the triniming punchwithin which slides the ejec= tor rod 7 and infront of which the 8 is positioned by mechanism not shown. Ejector rod? is easily removable and re placeable so that rodsof' different lengths may be used, the particular length'used being dependent upon the length of the blank being trimmed. A pair of die members 9 and 10 are carried by one end of the frame 1 and have mounted therein removable and interchangeable dieplates 11 and 12. A cam 13 is carried by power shaft 2' and'roitates therewith in the direction shown by the arrow. This cam engages roller 1% carried by shaft 15- mounted in the slide 5. Also carried by the power shaft 2: is a cam 16 which engages a roller 17 carried by a stub-shaft 18 mounted in a projection: 19 from the slide 5'. It will be clear from this that cam 13 arctuatesthe slide 5 in a forward direction to force the cap-screw blank 8 through the die plates 11 and 12 andthat cam 1:6 engaging roller 17 returns the slide to initial position.v

The opening in die-plate 12 has its faces parallel with those in die-plate 11, but it is slightly smaller than the opening in plate l 'l so that as the blanllr 8' pushed there- 'throujgh a thin shaving is takenfrom each of the faces of the cap-screw head, thereby trimming oil any unevenness left after assthe" latter effecting the rough cutting'or shearing of the head. It was found during the development of this machine that, if means were not provided for removal of thechips between the two die plates, the space would shortly fill up and cause rough'ening of the surface of the bolt on cap-screw heads as the same pass through the. second die-plate. There was also atendency to injure the cutting edge of the seconddie-plate and, for the foregoing reasons, mechanism was provided for the re moval of" the chips between the two' plates, before the passage of a bolt or capscrew through the second die member. p To aciiomjplish this function, a chip ejector" is surfaces.

moved transversely of the machine between the die members 9 and 10, preferably in a downward direction. This is accomplished by the action of lever 21 pivoted on the frame 1 at 22 and carrying a roller 23 which normally rides on shaft 2% carried by slide This shaft 2i has at its end an enlargement 25 which engages the roller 23 and causes lever 21 to be turned on its pivot to force the chip ejector 20 through the space between the die members, thus causing any chips clinging to die plate 12 to be ejected before the next blank is forced through the dies.

Starting with the cam 13 in the position shown in 3, the slide 5 is fully witlr drawn to what may be called initial position and the roller l-l contacts with cam 13 at point A. From position A to position B the slide is advanced rapidly by the cam 13, while from B to C the advance is much more slow. From C to D there is hesitation or substantially a pause in the forward movement of the slide to permit the metal of the cap-screw blank to reset, the purpose of which is to prevent tearing of the metal near the underside of the head as the last portion of the head goes through the first die, which takes place while the cam is traveling from the position D to the position E in contact with the roller 1 L, that part of the cam 13 between E and F causing the blank to pass through the second die. Belt and cap-screw makers have found that in pushing a metal piece through a die, with a substantially constant motion, the metal which goes through the die last has a tendency to tear very materially so that when the metal part emerges from the machine the surfaces thereof formed by the die during the latter part of its cutting action, are al most universally rough. Various expedients have been adopted in an elfort to secure bolts and cap-screws having heads with smooth It is believed that no machine has been produced prior to the presented invention which will accomplish this result and, certainly, none has been produced which will accomplish the same in so economical a manner, since the present machine requires but a single operation, whereas former methods of operation required the passage of the metal piece through a plurality of machines successively or through a single machine having other inherent defects.

After the head has been trimmed as de scribed above and the metal piece has reached the position shown in Fig. 7, cam at strikes roller 26 mounted 011 the inner end of lever 27 and causes this to be turned quickly about its pivot 28 so that the end of screw 29, carried by the end of arm 30, strikes the end 31 of lever or crank arm 32 a sharp blow. This in turn strikes the head 33 of ejector rod 7 so as to throw the blank 8 outwardly and leave the trimming punch 7 empty for the reception of another blank. The parts are shown in Fig. 5 in position for this operation to take place, and it will be seen from this figure that when the fly wheel 3 turns a short distance further cam 4 will strike roller 26 as described above. After the ejection of the blank 8, the machine is ready for the retraction of the slide 5, which begins when a point corresponding approximately to position G on cam it; strikes roller 17. This action continues until the point H on cam 16 passes said roller whereupon the slide is in position to begin again its forward movement, as soon as cam 13 comes into contact with roller 14.

Inasmuch as the mechanism for placing the blanks S in position between the trimming punch 7 and the die member 9 forms no part of the present invention, the construction thereof is neither disclosed nor claimed herein.

Crank arm 32 is supported on a pivot member 35, the ends of which extend into a boss 36 extending around three sides of the aperture in slide member 5 within which the roller 14 is mounted. This crank arm normally occupies the position shown in Fig. 3, and a sprlng 38 holds ejector rod 7 normally retracted, but yields to permit the blank to be ejected from trimming punch 7.

lVhen the trimming motion has been completed as shown in Fig. 5, crank arm 32 is in such position below the adjustable screw 29 that the lower end of said screw will strike the end 31 of arm 82, thus giving to ejector rod 7 the quick action referred to above for throwing the blank 8 out of trimming punch 7.

It is of course understood that the spe cific description of structure and method set forth above may be departed from without departing from the spirit of my invention as set forth in this specification and the appended claims.

Having now described my invention, I claim 1. In a metal shaping machine, a pair of aligned, spaced dies through which a formed piece of metal may be pas ed, a punch movable through said dies for successively moving the metal piece therethrough, means for causing apause in passing the metal through said machine to prevent tearing of the metal, and means movable intermittently through the space between the dies to remove any chips lodging therein.

2. In a metal shaping machine, a pair of aligned, spaced dies through which a formed piece of metal may be passed, means for forcing such a piece of metal through the dies, and means movable intermittently through the space between the dies to re move any chips lodging therein.

3. In a metal shaping machine, a pair of aligned, spaced dies through which formed 7 pieces of metal may be passed intermittent- 1y, means for forcing such pieces of metal through the dies, the second die being slightly smaller than the first, and chip removing means passing through the space between the dies transversely of the machine to remove any chips therefrom before a piece of metal is forced through the second die.

f. In a metal shaping machine, a pair of axially aligned, spaced die members, removable die plates secured to the die members, and chip removing means passing through the space between the dies to removetherefrom any chips before the passage of a metal piece through the second die.

5. In a metal shaping machine, a pair of axially aligned, spaced die members, aremovable die plate secured to each die member, chip removing means passing through the space between the dies to remove therefrom any chips before the passage of a metal piece through the second die, and means for passing a metal piece through the first die with a hesitating motion and then continuing the passage through the dies.

6. In a metal Working machine, a die, holding means for a metal part to be operated on, means to advance the holding means to force the metal part through the die, said advancing means including a cam shaped to cause the metal part to pass partly through the die and then hesitate before completing its passage and then continue to force the part completely through the die to complete said passage before acting on a succeeding metal part.

7. In a metal working machine, a die, holding means for a metal part to be operated on, means to advance the holding means to force the metal part through the die, said advancing means including a'cam shaped to cause the metal part to pass partly through the die and then hesitate before completing its passage, said mechanism also including a cam to cause retraction of the holding means after the metal part has been com pletely forced through the die. 4

In witness whereof, I hereunto subscribe myname to this specification.

JOHN LOOMIS WALKER. 

